Ventilating apparatus



Aug 11, 1942.

c. B. $CHN EIBLE VENTILAfI'ING APPARATUS Filed July 15, 1939 mafia.

Patented Aug. 11, 1942 UNITED STATES NT OFFECE 8 Claims.

This invention relates to ventilating apparatus and is particularly useful in connection with steel or sand, etc'., blast rooms where sharp particles, suchas pieces of steel, are thrown about the room.

An object of the invention is to provide a chamber equipped with means for enabling a direct flow of air to be carried downwardly through the floor of the chamber'in such a manner as to substantially eliminate eddy currents. A further object is to provide a chamber in which the bottom wall and upper wall are perforated to provide a direct downward flow, means being provided for the protection of the bottom wall or floor from abrasive or other particles, etc. Another object is to provide a chamber suitable for the handling of abrasive. and hard particles, the wall or the upper portion of the chamber being provided with means for permitting air to enter while preventing the escape of abrasive, etc. Other specific objects and advantages will appear as the specification proceeds.

The invention is illustrated, in a preferred embodiment, by the accompan ing drawing, in which- Figure 1 is a longitudinal sectional view of a housing structure embodying my invention; Fig. 2, a longitudinal sectional view of the top ventilating wall of the chamber; and Fig. 3, a longitudinal sectional view of the bottom or floor ventilating wall.

In the illustration given, I provide a suitable chamber having side walls H3 enclosing the same, an upper ventilating wall I l, and a lower or floor ventilating wall The side walls may, if desired, be provided with protective resilient blankets or the like, and suitable means, not shown, may be provided for permitting access and egress from the chamber. If the room is used as a steel or sand blast room, suitable apparatus for carrying on such operations will of' the chamber. Communicating with the enlarged end it is a trough ii in which is mounted a screw conveyor [.8 whereby the solid particles are removed to one side of the structure and collected sive or particles toward the enlarged end lb of for reuse. The air escapes through the conduit l9 and may be passed to a column wherein any dust or other particles are removed. Since the vibrating pan structure and the screw conveyor structure are well known, further detailed description is believed unnecessary.

The lower ventilating wall I2 is formed from a pair of plates, each plate having portions struck inwardly to provide telescoping connecting passages. In the illustration given, the lower plate 20 has inwardly struck or drawn nozzle portions 2|. The upper plate 22 has inwardly struck or drawn nozzle portions 23. The portions 23 extend within the tubular portions 2| of plate '29.

In order to protect the nozzle structure of the lower ventilating plate, I provide resilient tubular inserts 24 which hav restricted inner portions adapted to be recieved within th nozzles 23 of plates 29 and have wider and outwardly flared portions 25 which rest against the outer face of the plate 22, thus providing a complete protection for the plates as well as the inwardly turned nozzles 23. The rubber inserts may be removed when worn or whenit is desired to clean the apparatus. Escape of abrasive particles through the passages or apertures of the wall 12 is desirable since this brings such particles within the recovery pans below so that they may be passed by conveyor 18 to a point for reuse.

Escape of particles through the top ventilating wall H is, however, undesirable. For this reason, I provide a special form of structure which will permit air to enter while preventing the escape of abrasive, steel, or other particles. There is provided a two-plate structure, just as in the case of the floor member 12, the lower plate 26 having portions drawn upwardly to form tubular extensions 21. The upper plate 28 has wide portions thereof drawn downwardly and in wardly to form sharply inclined tubular funnel portions 29. The funnel portions 29 form rather sharp points for the upper portion of the plate instead of the broad faces provided for the lower plate 25. The funnel portions 28 receive the funnel portions 21 in telescoping relation. Rubber inserts 30 similar to inserts 24 are employed to extend within the lower nozzles 21 and to protect the face of plate 26.

Above the plate 28 I provide a second plate 3| which has openings 32 formed therein above the points of the plate 28 to permit the entrance of air. Between the openings 32 are downwardly bent deflector portions 33 which cooperate with the inclined walls 29 for directing any abrasive thrown upwardly between the surfaces 29 and. 33 and thence downwardly into the chamber. With the structure shown, air may freely enter, but abrasive is prevented from leaving the chamber.

In the operation of the device, steel or sand blasting operations are carried on within the chamber provided by the casing and air is caused to flow downwardly through the chamber and out through the bottom perforated wall l2. Abrasive, which is thrown upwardly in the operations against the top wall I l, is caught, by the deflector surfaces and caused to return into the chamber, the resilient protecting members aiding in the quick return of such particles toward the floor ventilating wall l2. From the floor ventilating wall, the abrasive falls upon the vibrating pans which move it slowly and evenly, permitting drying thereof under the infiuence of the air passing thereover, until it reaches the screw conveyor l8 which carries it to a point where it may be reused.

While I have shown the walls I l and I2 formed in a certain way from a pair of plates, it will be understood that, if desired, a single plate with nozzles extending therethrough or other suitable ventilating walls may be employed.

The apparatus is suitable for carrying on dry or wet sand and other abrasive or steel blasting operations, it permits quick recovery of the abrasive or other particles used, and the recovery thereof in condition for reuse.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim:

1. In ventilating apparatus of the class set forth, a casing providing a chamber, the top portion of said casing being apertured to permit the intake of air, and the floor portion'of said casing being apertured to permit the escape of air, means providing a chamber below said floor, a suction pipe communicating with said lower chamber and with a source of suction, means for collecting particles passing through said floor and for moving the same toward a point of exit, and abrasive-resistant inserts extending into and about apertures in said chamber casing.

2. In ventilating apparatus of the class set forth, a casing having its upper wall perforated to provide an air inlet, a ventilating floor in the lower portion of said casing, said ventilating floor comprising a pair of plates having tubular portions struck therefrom and brought into telescoping relation forming tubular air outlets therein, said upper wall and floor providing a work chamber adapted to be ventilated by the passage of air therethrough, and resilient inserts extending into said tubular portions.

3. In ventilating apparatus of the class set forth, a casing having an upper portion thereof apertured for the intake of air, a floor for said casing including a plate member having portions thereof drawn downwardly to provide air outlet funnels, and resilient inserts received within said funnels.

4. In ventilating apparatus of the class set forth, a casing having an upper ventilating wall and an apertured floor, said casing being adapted to be ventilated by the passage of air in through said ventilating wall and out through said apertured floor, said upper ventilating wall comprising a pair of plates having inwardly drawn nozzle portions arranged in telescoping relation, said upper nozzle members being inclined so as to provide pointed top faces, and a deflector plate supported above said structure and cooperating with said inclined walls for directing particles downwardly.

5. In ventilating apparatus of the class set forth, a casing having an upper ventilating wall and an apertured floor, said casing being adapted to be ventilated by the passage of air in through said ventilating wall and out through said apertured floor, said upper ventilating wall comprising a pair of plates having inwardly drawn nozzle portions arranged in telescoping relation, said upper nozzle members being inclined so as to provide pointed top faces, and a deflector plate supported above said structure and cooperating with said inclined walls for directing particles downwardly, said deflector plate being provided with air inlet openings above said pointed faces.

6. In ventilating apparatus of the class set forth, a casing having at its top a ventilating wall and a floor apertured to permit the escape of air from the chamber, said casing being adapted to be ventilated by the passage of air inwardly through said ventilating wall and outwardly through said floor, said ventilating wall having a plate provided with upwardly extending nozzles, and resilient tubular inserts within said nozzles.

7. In ventilating apparatus of the class set forth, a casing having at its top a ventilating wall and a floor apertured to permit the escape of air from the chamber, said casing being adapted to be ventilated by the passage of air inwardly through said ventilating wall and outwardly through said floor, said ventilating wall having a plate provided with upwardly extending nozzles, and resilient tubular inserts received within said nozzles and having flared portions extending over the exposed plate portions to protect the same.

8. In ventilating apparatus of the class set forth, a casing adapted to be ventilated by the downward passage of air therethrough having an upper portion thereof apertured for the intake of air, a floor for said casing having a plurality of openings therein providing air outlets, and resilient inserts received within said openmgs.

CLAUDE B. SCHNEIBLE. 

